Hi
I want analysis a 3D fan in fluent but I want to model only one of two blades(the fan has two blade) , but when I use symmetry boundary condition, the solution does not converge. and I think it is logic because in fan we do not have symmetry condition , rather we have rotation axis , but in 3D we can not use axis condition. is any body can help me ?

As you already realized, there is no symmetry condition for your given flow problem. Maybe a rotationally periodical boundary condition can be utilized to reduce the computational domain to a 180° segment?
cheers

It depends on the periodicity of your actual geometry and flow field. Have a look at the UserGuid chapter 7.15 whether periodic bc are applicable for your problem. If so, you have to obey some rules when generating the mesh in gambit (mesh hardlink).

Hi Cogline
I do hardlink mesh and after that exported mesh, but when I import in fluent , we have an Error , can you guess what is the problem ?
you can receive mesh file and gambit file(dbs) from below link.http://ifile.it/voabcxt/Gambit.rar
thanks
Memar

Last edited by v_h_memar; April 14, 2010 at 04:11.
Reason: Attaching file